II.31. A paracentric inversion in barley.
Ganesh Prasad*, Department of Genetics and Plant Breeding, Banaras Hindu University, Varanasi 221005, India.
* Present Address: Department of Agricultural Botany, S. D. J. Post Graduate College Chandesar, Azamgarh, U.P., India
A partial sterile plant was observed in the progeny of a cross between a 6-rowed cultivated barley variety K 24 and a 2-rowed exotic barley culture EB 772. Pollen and ovule sterility were 27.2 and 33.0 percent, respectively. Cytology revealed the presence of bridges and fragments at both the anaphases of meiosis. The findings indicated that this plant had a paracentric inversion. The different configurations observed can be grouped as follows:
Anaphase I:
1) One bridge with one fragment (BF)
2) Two bridges with two fragments (BBFF)
3) One fragment without bridge i.e. loop plus fragment (LF)
4) Two fragments without bridge i.e. two loops plus two fragments (LLFF)
5) Others such as lagging chromosomes.
Anaphase II:
1) One fragment without bridge (BF)
2) Two fragments without bridge (BBFF)
3) One bridge in one of the dyads plus one fragment (LF)
4) One bridge in each dyad plus two fragments (LLFF)
5) Others such as laggards.
The frequencies of different types of configurations are shown in the following table:
Further work on the progeny of this plant is in progress.
